Tonight, Jenny and I went to a fireworks show where they handed out Spectrometetry glasses (hyped up as "3D glasses for fireworks"). They were SO COOL!!! You could see all the different spectral lines for each of the different colors of fireworks, not to mention making the fireworks occupy an order of magnitude more of the sky. Has anybody else seen these?

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Paul Gurney: Seems like these things are pretty easy to get and cheap...